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Any place there is much sliding or rotating motion (especially while under pressure) it is better to use a bushing to reduce wear. Regardless grease or oil lube will extend the life of the parts a...

Check places that sell bearings, bronze bushings are very common. Or just try buying internationally thru places like ebay or amazon. If it is easier for those outside of the US, substituting shaft...

They should be a light to medium press fit into the plates, and a sliding fit on the shafts. The hole about 0.0003 to 0.0007" smaller then the bushing OD.

A light press fit with loctite is better...

For the cross brace any reason it can't be above the base plate when the link arms are shortened for reloading type use. Then I can just have the one location for the cross brace that works well for...

I wanted to play with the model to check operation, so I modeled everything. I'll probably do some new prints at some point as well (no promises though)
There were a few changes I made so far, most...